best mosfet
Microwatt, Sun Mar 13 2011, 07:51PMwhat is the best mosfet for a mazelli driver?
Re: best mosfet
Steve Conner, Sun Mar 13 2011, 08:27PM
Oh come on, that's like asking "What is the best tire for a car".
Most people use whatever MOSFET they can find cheaply at their local surplus electronic store or on Ebay. The IRFP250, IRFP460 etc are old favourites.
The MOSFETs need to be rated for pi times the supply voltage. If you want to run the thing off a high voltage, IGBTs start to become attractive. Mazzilli's original oscillator actually ran off 320V DC and used 1200V IGBTs: the BUP314D from Siemens/Infineon, which was available cheaply in Europe at the time.
And by the same token, if you only have a very low voltage power supply, like a 12V battery, then you should be looking at 50V or 100V MOSFETs, these are available with extremely low Rds(on) for efficient operation.
So, in other words, it depends on what kind of car and where you're going to drive it.
Steve Conner, Sun Mar 13 2011, 08:27PM
Oh come on, that's like asking "What is the best tire for a car".
Most people use whatever MOSFET they can find cheaply at their local surplus electronic store or on Ebay. The IRFP250, IRFP460 etc are old favourites.
The MOSFETs need to be rated for pi times the supply voltage. If you want to run the thing off a high voltage, IGBTs start to become attractive. Mazzilli's original oscillator actually ran off 320V DC and used 1200V IGBTs: the BUP314D from Siemens/Infineon, which was available cheaply in Europe at the time.
And by the same token, if you only have a very low voltage power supply, like a 12V battery, then you should be looking at 50V or 100V MOSFETs, these are available with extremely low Rds(on) for efficient operation.
So, in other words, it depends on what kind of car and where you're going to drive it.
Re: best mosfet
HazzWold 1993, Sun Mar 13 2011, 09:50PM
Well you learn something new every day, thanks for the fun fact!
HazzWold 1993, Sun Mar 13 2011, 09:50PM
Steve McConner wrote ...
MOSFETs need to be rated for pi times the supply voltage. If you want to run the thing off a high voltage, IGBTs start to become attractive. Mazzilli's original oscillator actually ran off 320V DC and used 1200V IGBTs: the BUP314D from Siemens/Infineon, which was available cheaply in Europe at the time.
MOSFETs need to be rated for pi times the supply voltage. If you want to run the thing off a high voltage, IGBTs start to become attractive. Mazzilli's original oscillator actually ran off 320V DC and used 1200V IGBTs: the BUP314D from Siemens/Infineon, which was available cheaply in Europe at the time.
Well you learn something new every day, thanks for the fun fact!
Re: best mosfet
haxor5354, Sun Mar 13 2011, 09:51PM
I don't always buy with mosfets, but when I do, I prefer IRFP260
haxor5354, Sun Mar 13 2011, 09:51PM
I don't always buy with mosfets, but when I do, I prefer IRFP260
Re: best mosfet
Microwatt, Mon Mar 14 2011, 01:42AM
the most interesting semiconductor in the world?
Microwatt, Mon Mar 14 2011, 01:42AM
the most interesting semiconductor in the world?
Re: best mosfet
James, Mon Mar 14 2011, 02:22AM
I'm using IRFP240s in one, but almost any mosfet with sufficient voltage and current ratings for the power you wish to run it at will work. With low resistance mosfets you don't even need a heatsink in most cases, but I did blow a mosfet once due to thermal runaway when I was pushing ~400W through the driver to do induction heating so a small heatsink is recommended.
If you want to run it from higher than about 60V, I recommend improving the gate drive arrangement a bit, something like this
There are of course a zillion different choices for the gate driver and since they're both low side you don't have to use fancy expensive HV floating gate drive ICs.
James, Mon Mar 14 2011, 02:22AM
I'm using IRFP240s in one, but almost any mosfet with sufficient voltage and current ratings for the power you wish to run it at will work. With low resistance mosfets you don't even need a heatsink in most cases, but I did blow a mosfet once due to thermal runaway when I was pushing ~400W through the driver to do induction heating so a small heatsink is recommended.
If you want to run it from higher than about 60V, I recommend improving the gate drive arrangement a bit, something like this
There are of course a zillion different choices for the gate driver and since they're both low side you don't have to use fancy expensive HV floating gate drive ICs.Print this page